Dental press for forming wax patterns



Sept. 20, 1938. 5-, MILL R 2,130,593

DENTAL PRESS FOR FORMING WAX PATTERNS Filed Sept. 8, 1957 ORNEY Patented Sept. 20, 1938 r PATENT OFFICE DENTAL PRESS FOR- FO-RMIING WAX I PATTERNS Fred C. Miller, Los Fresnos, Tex.

Application September 8, 1937, Serial No. 162,934.

4 Claims.

This invention relates to a press for forming a wax pattern for use in casting a metallic backing for interchangeable teeth for either fixed or removable bridge-work, and it consists in the 5 constructions, arrangements and combinations herein described and claimed.

It is an object ofthe invention to provide a press of simple construction embodying means whereby a wax pattern. is formed embodying the lingual anatomy of the tooth.

It is also an object of the invention to construct the press in such manner that the impression plate may be mounted in the press in one position only, thereby insuring proper registry between the die and the wax.

Additional objects, advantages and features of invention will be apparent fromthe following description considered in conjunction with the accompanying drawing, wherein Figure l is a sectional View of the press, in

use.

Figure 2 is a top plan view of the press foot with the impression and lock plate removed.

Figure 3 is a side elevation of the press foot.

Figure 4 is an end view thereof.

Figure 5 is a bottom plan view of the impression plate.

Figure 6 is a side view thereof.

Figure '7 is an end view of the impression plate.

Figure 8 is a top plan view of the lock plate.

Figure 9 is an end elevation thereof.

Figure 10 is a fragmentary top plan view of the wax manipulating handle.

Figure 1 1 is a cross section on the line IIII 5 of Figure 10.

There is illustrated in Figure 1, a base I which may be of wood or otherwise, and of any suitable dimensions, upon one end of which there is mounted a press foot II. The foot II is formed from a single blank of proper gauge metal, bent intermediate its length to form two parallel side plates I2. The lower edge of the plates I2 are bent at right angles in opposite directions, affording a substantial base I3, and to the base it a reinforcing plate I I is welded or otherwise secured. The base I3 and the plate It are apertured to receive screws I for securely mounting the press foot to the base I0.

The upper edge of the plates I2 have a laterally extended flange I 6 which cooperate with respective channels I I of a lock plate I8, as will be described more fully hereinafter.

As may be seen from Figures 2 and 4, the press foot II is unconnected at oneend, and intermediate the height of the walls I2 inturned lugs I9 are formed, the latter providing a fulcrum point for a manipulating lever 29.

An impression plate 2| is provided, in the present instance being shown as a rectangular plate of a size to snugly fit over the flange I6 of the press foot, the end portions of the plate being downwardly bent as at 22 and 23. The downturned portion 22 is of a height less than the portion 23 and is slidably received in the channels ll of the lock plate I8; the portions 23 being of a height such that it will not be admitted through the channel. By this arrangement, the downturned portion 23 must be positioned to the forward .end of the press foot, if the locking plate is to be engaged on the flanges I6. Obviously, reverse positioning of the impression plate is prevented.

The impression plate 2| has formed upon'the underside thereof a well-24 for reception of impression or sealing wax 25 and this well may be of any size and depth necessary for a given work.

The manipulating lever 20 comprises a handle portion 26 and a head portion 21. Upon the head 21 a wax holding block 28 is mounted by a screw 28' so positioned as to present a pellet of wax supported thereon into registry with the die 29 of the impression plate. The head portion 21 has a kerf 30 adapted to engage the lugs I9, when the lever 20 is positioned between the walls of the press foot.

As may be seen from Figures 10 and 11, the block 28 is composed of a pair of sections 3| and 32 laid in side by side contacting relation and secured by a rivet 33. The metal of the sections along their inner edges is cut away to a point medially thereof, and when the sections are assembled, form a dove-tailed groove 34, and presenting an open slot 35 upon the upper face of the block 28.

In use, an impression is made in the wax 25, the impression plate 2| laid upon the flanges I6, the flange 23 being positioned toward the front. The open end of the lock plate is then presented so as'to receive the plate 2| and the flanges I6 within the channels I! thereof. The lock plate I8 is then moved forwardly, which may be accomplished by grasping the upwardly curved lip I8, thereby securing the impression plate to the press foot II. dicated at W in Figure 10, is laid upon the block 28 directly over the slot 35, when the lever 20 is placed between the walls l2 so as to position the block 28 directly beneath the die 29, the kerf 3B 7 receiving the lugs I9 therein. A downward pres- A pellet of Wax, in-

sure of the handle 26 will cause an upward movement of the block 28, forcing the wax into the die 29 and receives the impression therefrom, some of the wax being extruded into the dovetailed groove 34. The lever 2|] is then removed from the press, and the wax impression on the block 28 is then removed by gently sliding the wax impression longitudinally along the slot 35 until the rib formed by extruding the wax thereinto has cleared the groove. From the wax impression thus obtained, the tooth backing may be cast in whatever material desired.

While I have shown and described a preferred form of the device, this is by Wayof illustration only, and I consider as my own all such modi' fications in structure .as fairly fall within the scope of the appended claims.

I claim: i v

1. A press for forming a wax pattern for interchangeable teeth comprising a support having parallel upstanding walls, the upper edges of the walls having an oppositely extended flange, a fulcrum member intermediate the height of the Walls, an impression plate removably supported upon the flanges, the impression plate having a die upon its underside, a lock plate slidably engaging the flanges and the impression an opposite disposed flange at the upper edge of the walls, an impression plate supported by the flanges,'the plate having down-turned ends to engage the end edges of the flanges; a lock plate having inturned side flanges and an end flange spaced to slidably engage the first named flanges and the impression plate; inwardly turned lugs on the Wall members intermediate the height thereof; a lever member cooperable with the lugs for swinging movements toward and away from the impression plate, the impression plate having a die uponv the underface thereof, said lever having a head for support of a pellet of wax, and said head member having a longitudinally extended open-ended slot for receiving wax forced thereinto when the head member is moved into engagement with the die.

3. A press for forming a wax pattern for interchangeable teeth comprising an upwardly open-ended support means, an impression plate removably supported upon the open end of the support means, said supporting means having a fulcrum intermediate its height, a lever member cooperable with the fulcrum, the lever having a head member for support of a pellet of wax, and said head member being movable to engage the impression plate.

4. A press for forming a wax pattern for interchangeable teeth comprising an upwardly open-ended support means, an impression plate removably supported upon the open end of the support means, said plate having a die upon its under face, said support means having a fulcrum intermediate its height, a lever member cooperable with the fulcrum, the lever having a head member for support of a pellet of wax, and. the head member having a slot for receiving wax forced thereinto under pressure when the head member is moved into engagement with the die.

FRED C. MILLER. 

